字符串轉日期

//字符串按指定dateFormat轉化爲Date
//dateFormat 爲 "yy-MM-dd HH:mm:ss"等
	public static Date strToDate(String str,String dateFormat) {		  
		   SimpleDateFormat format = new SimpleDateFormat(dateFormat);
		   Date date = null;
		   try {
		    date = format.parse(str);
		   } catch (ParseException e) {
		    e.printStackTrace();
		   }
		   return date;
		}